Portable electric drilling-machine.



PATENTED AUG[ 21, 1906.

J. MAGLEAN. PORTABLE ELECTRIC DRILLING MACHINE.

APPLICATION FILED JAN.12.1906.

5 SHEETS-SHEET 1.

-PATENTED AUG. 21, 1906.

J. MAGLEAN. PORTABLE ELECTRIC DRILLING MACHINE.

APPLICATION FILED JAN.12. 1906.

5 SHEETS-SHEET 2.

N0. 828,945. PATENTED AUG. 21. 1906.

J. MAOLEAN. PORTABLE ELECTRIC DRILLING MACHINE APPLICATION FILED JAILIZ.1906.

5 SHEETS-SHEET 8.

PATENTED AUG. 21, 1 906. J. MACLEAN. PORTABLE ELECTRIC DRILLING MACHINE.

APPLICATION FILED JAN.12.1906.

5 SHEETS-SHEET 4.

APPLICATION FILED JAN. 12. 1906.-

6 SHEETS-SHEET 5,

; Fig. 8 is UNITED snares PATENT $pecification of Letters Patent.

Patented Aug. 21, 1906.

Application filed January 12,1906. Serial No. 295,787.

To all whom it may concern.-

Be it known that 1, JOHN MACLEA consulting engineer, a subject of theKing of Great Britain, residing at 50 Wellwood road, Goodmayes, Ilford,Essex, England, have invented certain new and useful Improvements inPortable Electric Drilling Machines, of which the following is aspecification.

This invention relates to portable electric drilling-machines and it hasfor its object to provide a powerful electric drill which shall yet beof a comparatively light Weight.

p In order that the invention may be clearly understood, I have hereuntoappended five explanatory sheets of drawings, whereon- Fi ure 1 is apart elevation and a part longitudinal section of the drill. Fig. 2 is aplan thereof. Fig. 3 is a cross-section on the line X K, Fig. 1. Fig. 4is a section on the line Y Y. Fig. 5 is a longitudinal section of thearmature. Fig. 6 is a view of one end, and Fig. 7 a View of the otherend, of the armature. a view of the drill end of machine. Fig. 9 is aview of the feedv end of machine. Fig. 10 is an end view of thehand-feed. Figs. 11, 12, and 13 are views of brush-gear.

On the drawings the same reference characters wherever repeated indicatethe same parts.

In this machine the motor is of special construction, whereby greatpower with little weight is obtained. The armature of the motor, whichis external to the field-magnets round which it revolves, consists, asshown at Figs. 5, 6, and 7, of a thin hollow cylinder, preferably madeup of stampings slotted on their inner periphery to receive thearmaturecoils. These stampings, which are marked a, are held in place bytwo end rings 1) c, of aluminium, bolted together by bolts d. The endring I) is united to an end-plate ring e by four or other suitablenumber of arms f, so that the distance between the rings is suflicientto accommodate the ends of the armature-coils. This end-plate ring isfitted to an end late g, of aluminium, which contains the ba l-bearingit of that end of the armature. The cup ha of this ball-bearing isextended and provided with teeth constituting asteel pinion i, by meansof which the motor is geared, as hereinafter explained. The other endrin c of the armature is connected similarly h arms 7' to a ring-7c,which accommodates the commutator Z, which is of the ordinary type. Thiscommutator is of a construction which on a pin 19, in

allows of great lightness and strength and ease with which the armatureconnections can be made. It consists, preferably, ofa number ofhard-drawn copper bars or blocks m, arranged in a ring and suitablyinsulated by mica or other insulating material from one another and fromthe end rings, m m. These end rings bind the whole of the bars and aresecured together by the screw-pins n, the outer periphery of thecommutator forming the brush-surface. The bars are dovetailed atbothends, and the end rings being machined to suit this section therebyhold the bars rigidly in place.

The armature end ring 76, into which the commutator fits and is secured,is united to a central ball-bearing boss p by arms p. The field-magnetstampings g are built up central fixed shaft 1, on which are fixed theseveral ball-bearing cones and brackets which are required in thecomplete machine.

The motor is preferably geared in two stages which are or may beidentical in their arrangement. The armature end-plate pinion c', beforementioned, gears with a rawhide pinion 8, carried on a pin 8 in a coned.bracket 15, fixed to the central shaft. This rawhide pinion 8 furthergears with an internallytoothed ring it, carried on an end plate e,which runs on. ball-bearings w on the aforesaid coned'bracket, the wholeforming a neat, compact, and light reduction-gear. The end plate 0,containing the internal toothed ring a, is fitted to a skeleton cylinderor frame as, (of which the ring a may form a part) which just "11s cleararound the motorarmature and ias a ball-bearing end plate a at the endremote from the gear. For small'drillingmachines thisreduction-gear setis sufiicient; but

for machines as generally used aisecond gear set is provided. In thiscase the end plate 2) has the cup 1; of its ball-bearing so formed asona.

to serve as a steel pinion o similarly to the armature ball-cup beforedescribed, and this pinion gears with aiawhide pinion i, carried a conedbracket t, fixed to the shaft 1'. The pins 8 and i carrying the pinions8. and 'i, are screwed into their respective brackets in such a mannerthat the rotation of the pinions tends to tighten the pinsin thebrackets and not slacken them. The pinion i gears with aninternally-toothed ring a, secured to an end plate v screwed on the shoit cuppedspindle y, into which the drill (not shown) may be fitted. Theend plate 0 is secured i a cylinder :0 which incloscs the l1,12,and13.

cured to it an eccentric e, on the side of which works the roller 0fitted to 5 the levere This lever is keyed or otherwise secured to ashaft of, givingan oscillating motion thereto;

This oscillating motion is transmitted by an pawl e, which gears inaratchet wheel e,- secured to the nut F. As this nut has only circularmovement, therotation. given to it by the ratchet feeds the drillfor-ward by means of the screw E,

To enable the drill to be fed-forward by hand, a handle-H, which is madeone with a collar it, fitted to the boss of frame end plate B, is alsoprovided with a pawl '11,- which ears in the teeth of the ratchet-Wheel,sepurded to the nut F, and thus gives a hand The framework of themachine consists of two aluminium end plates A B,- united' by threesteel rods or tubes C, C, and C The end late B of the framework carriesthe switc D, which controlsthe-electric current. The shaft r of thecentral field-magnet is fitted rigidly in this end plate. The end plateA of the framework has a'central hardened-steel collar G, fitting overthe spindle 4 .which rotates within it. This collar forms a bearin Thebruslngear G is clearly shown in Fl s.

It consists of a rocker, of suitable light material, having two armsland 2 at right angles. Secured to and insulated from these arms are thebrush-holders 3 and 4c. The brushes 5 are of carbon andare rectangularin shape, being held on the commutator by the levers 6, the pressurebeing regulated by the springs 7. The rocker is fixed in any desiredposition to the shaft r by the pin'8.

The corner drilling arrangement is shown in Figs. 1 and 2. It will beseen that the end plate A is extended to a boss A, into which are fittedtwo rods or tubes C- O which run parallel with and are just clear of thema chine and unite the one side of the two end plates A B. The otherside of the end plates are united by the single rod or tube C, which aswill be seen, is so formed as to serve as a handle by means of which themachine may be carried and held. The spindle or socket y in this casehas a pinion y, which gears with an intermediate pinion y, which latterdrives a pinion y on a spindle or shaft y, running in ball-bearings inthe boss A, said shaft y having connected therewith many suitable mannera socket 11 Motion is transmitted from the spindle or socket y to thedrill by the gear y y y. In this case the feed may e arranged as shown-5. e., in line rotating assets with the drill-by transferring the wholeof the feedcar from the center to the side borin spindle.

I he construction of the drill can of course be altered or varied in itsdetails of construction according to the work it is to perform.

Having now fully described my invention,

*what I'claim, and desire to secure by Letters Patent, is

1. A portable electric drill comprising, in

frame; a magneton the shaft, an armature arranged externally of the maet, a commu-tat-or and an inclosing cylin er or frame- Work, saidcylinder or framework being driven by gear from the armature and be ingadapted to rotate the'drill.

2. A portable electric drill comprising, in combination, a frame, afixed shaft in the frame, a switch, feeding mechanism, a magnet on theshaft, an armature arranged externally of the magnet, a commutator, "askeleton frame driven by gearing from the armature, an inclosingcylinder or framework driven from the skeleton. frame aforesaid, saidinclosing cylinder or framework having a socket in which the drill isfitted, the several working parts running in ball-bearings.

3. A portable electric drill comprising, in combination, a frame, afixed shaft in the frame, a magnet on the shaft, an armature arrangedexternally of the magnet, a commutator, an inclosing cylinder orframework, gear for driving the cylinder from the armaturc, meansconnected with the cylinder for the drill, means for feeding the drillforwar automatically and also forfeeding it by hand.

4. A portable electric-drill comprising, in combination, a frame, afixed shaft in the frame, a switch, feeding mechanism, a magnet on theshaft, an armature arranged onternally of'the magnet, a commutator, a

skeleton frame running upon ball-bearings on the shaft, internal teethon this frame, a gear-wheel gearing with the teeth and with a pinioncarried on a sleeve running in ballhearings on the shaft, said sleevebeing connected to the armature, and means connected with the skeletonframe for rotating the drill.

5. A portable electric drill comprising, in combination, a frame, afixed shaft in the 1 frame, a switch, feeding mechanism, a magnet on theshaft, an armature arranged externally of the magnet, a commutator, askeleton frame having internal teeth thereon, a gear-wheel gearing withsaid teeth on the one hand and with a pinion connected with the armatureon the other hand, a bracket for supportin the gear-wheel an inclosincylinder fitte on the shaft at one end and connected with a socketadapted to receive the drill at the other end, internal teeth on theinclosing cylinder, a gear-wheel, a inion running in bal bearings andconnects with combination, a frame, a fixed shaft in the other lever eatwhose opposite end-is fitteda 1 a skeleton frame, and a bracket forsupport-- ing the gear-Wheel.

6. A portable electric drill comprising, in combination, a frame, afixed shaftin the frame, a magnet on the shaft, an armature arrangedexternally of the mutator, an inclosing' cylinder, gear connected withthe armature for rotating the cylinder, a socket connected with thecylinder,'a bracket on the frame, ashort shaft with a second sockettherein carriedby the bracket, teeth on this socket, external teeth onthe socket of the inclosin cylinder and an intermediate. inion adapte toengage with said teeth an with the teeth of the second socket.

7. A portable electric drill comprising, in combination, a frame, afixed shaft in the frame, a magnet on the shaft, an armature magnet, acom arranged externally of the magnet, a commutator, an inclosing cy derdriven b gear from the armature, a socket connecte with the cylinder, onthe frame, end thereof carriedby the bracket, teeth on both sockets, anintermediate pinion, a screw for feeding the drill, ratchet mechanismfor operatin the screw, a second bracket with screw-ho e therein whichis in linewith the second socket and which is adapted to receiveafeed-screw. T

Intestimony whereof I afiix my signature in presence of two Witnesses.

JOHN

Witnesses:

' J. SHAND SIVEWEIGHT,

-WILLIAM W. S1vE wE1eHT teeth on the socket, a bracket a shaft having asocket at one:

as I

MACLEAN.

